Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10ba6fb6554cbee…

MALICIOUS

PDF

70.2 KB Created: 2021-03-06 15:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d33d6c41ea5128811a1893d0e3e9a3b8 SHA-1: 55baeb18ecbfad9bfa07994fe71c8472b54acea5 SHA-256: a10ba6fb6554cbeefaf060f7306f9d771b000e7bb49fd2b2075a88c6e3a2500c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains or use UTM parameters, indicating a link farm or SEO manipulation tactic. The primary URL, 'https://zajinet.ru/wix?keyword=play+realm+of+the+mad+god+unblocked+at+school', suggests a lure to a game, likely to generate ad revenue or traffic. ClamAV and ML classifiers also flagged this PDF as malicious, supporting its classification as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/wix?keyword=play+realm+of+the+mad+god+unblocked+at+school PDF link annotation
    • https://cdn.sqhk.co/mebosuxular/bMZMxXd/best_free_video_editing_software_for_social_media.pdfIn PDF document text
    • http://lady-bug.club/tisumazidabapair28u.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/agchaie/37623011054.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/fakewuvib_juxijerim_vedeb_xosubulawozi.pdfIn PDF document text
    • http://lewodazegozi.iblogger.org/vinibik.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/29741.pdfIn PDF document text
    • http://nebibila.iblogger.org/epson_wf_2630_ink_replacement_instructions.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/6913663.pdfIn PDF document text
    • http://baby-slings.ru/448311209730ih6g.pdfIn PDF document text
    • http://onlinesos.tech/chauvet_dj_freedom_par_tri-_6_manualdrrz6.pdfIn PDF document text
    • https://gavurudujugewi.weebly.com/uploads/1/3/4/3/134361378/9be19c2d74bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_a226146ee41d41788e43303e9ab68665.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_3e169ddb20814733863e51943c842f37.pdf?index=trueIn PDF document text
    • http://govusilewirot.rf.gd/39679144768.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_6805095593274c68b5b99e46b32e3b85.pdf?index=trueIn PDF document text
    • http://fububosuvakosal.epizy.com/d_d_3._5_dragonborn_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d2151e-15b9-4ee8-986a-34345665f98d/the_500_greatest_songs_of_all_time_spotify.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c7313f-4d5b-4af8-9526-c2141a459968/best_pool_basketball_hoop_2020.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a3f5adec4bcc4f9f82dd91d943c69201.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_114ee478bd8a4029bd4c94ad551f1ab8.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 5740 bytes
SHA-256: ec3cc8b8d7ed14e3f6d0de19a08d5ddb673f56d214d354e75e823919184055d6
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 10844 bytes
SHA-256: cab21083634a34a2dfa3bcef9f7a68106bdb198d06e5601e3f95c1393064a45f